using AutoMapper;
using BaseData.WriteApi.Appcontext.Command.Sheep_Records;
using MediatR;
using SmartTracking.Domain.HQX;
using SmartTracking.ErrorCode;
using SmartTracking.Infrastructure.Interfaces;

namespace BaseData.WriteApi.Appcontext.CommandHandler.Sheep_Records
{
    /// <summary>
    /// 羊只档案删除命令处理器（逻辑删除）
    /// </summary>
    public class DeleteSheepRecordCommandHandler : IRequestHandler<DeleteSheepRecordCommand, ApiResult<bool>>
    {
        private readonly IBaseRepository<SheepRecords> _sheepRecordRepository;
        private readonly IMapper _mapper;
        private readonly ILogger<DeleteSheepRecordCommandHandler> _logger;

        public DeleteSheepRecordCommandHandler(
            IBaseRepository<SheepRecords> sheepRecordRepository,
            IMapper mapper,
            ILogger<DeleteSheepRecordCommandHandler> logger)
        {
            _sheepRecordRepository = sheepRecordRepository;
            _mapper = mapper;
            _logger = logger;
        }

        /// <summary>
        /// 处理羊只档案删除命令（逻辑删除）
        /// </summary>
        /// <param name="request">羊只档案删除命令</param>
        /// <param name="cancellationToken">取消令牌</param>
        /// <returns>删除结果</returns>
        public async Task<ApiResult<bool>> Handle(DeleteSheepRecordCommand request, CancellationToken cancellationToken)
        {
            try
            {
                // 验证请求参数
                if (request == null)
                {
                    _logger.LogWarning("羊只档案删除请求参数为空");
                    return new ApiResult<bool> { Code = ApiEnum.删除失败, Message = "请求参数不能为空", data = false };
                }

                // 验证数据
                if (!request.Validate(out string errorMessage))
                {
                    _logger.LogWarning($"羊只档案删除数据验证失败: {errorMessage}");
                    return new ApiResult<bool> { Code = ApiEnum.删除失败, Message = errorMessage, data = false };
                }

                // 根据ID查询羊只档案
                var sheepRecord = await _sheepRecordRepository.GetByIdAsync(request.SheepId);
                
                if (sheepRecord == null)
                {
                    _logger.LogWarning($"未找到ID为 {request.SheepId} 的羊只档案");
                    return new ApiResult<bool> { Code = ApiEnum.查询失败, Message = "未找到指定的羊只档案", data = false };
                }

                // 检查是否已被删除
                if (sheepRecord.IsDeleted)
                {
                    _logger.LogWarning($"ID为 {request.SheepId} 的羊只档案已被删除");
                    return new ApiResult<bool> { Code = ApiEnum.查询失败, Message = "羊只档案已被删除", data = false };
                }

                // 执行逻辑删除（更新IsDeleted状态）
                sheepRecord.IsDeleted = true;
                var result = await _sheepRecordRepository.UpdateAsync(sheepRecord);
                
                if (result>0)
                {
                    _logger.LogInformation($"成功删除羊只档案，ID: {request.SheepId}");
                    return new ApiResult<bool> { Code = ApiEnum.删除成功, Message = "羊只档案删除成功", data = true };
                }
                else
                {
                    _logger.LogError($"删除羊只档案失败，ID: {request.SheepId}");
                    return new ApiResult<bool> { Code = ApiEnum.删除失败, Message = "羊只档案删除失败", data = false };
                }
            }
            catch (ArgumentException ex)
            {
                _logger.LogWarning($"参数验证异常: {ex.Message}");
                return new ApiResult<bool> { Code = ApiEnum.删除失败, Message = ex.Message, data = false };
            }
            catch (Exception ex)
            {
                _logger.LogError(ex, $"删除羊只档案时发生系统异常: {ex.Message}");
                return new ApiResult<bool> { Code = ApiEnum.删除失败, Message = "系统异常，请联系管理员", data = false };
            }
        }
    }
}